Mesoscale Discussion 1857
   NWS Storm Prediction Center Norman OK
   0333 AM CST Thu Dec 17 2020

   Areas affected...central NY...southern VT/NH...far northwestern
   MA...far southern Maine

   Concerning...Heavy snow 

   Valid 170933Z - 171530Z

   SUMMARY...Heavy snowfall rates ranging from 2-4 inches per hour are
   expected to continue across central NY through 12z.  These snowfall
   rates have begun to develop over southern VT/NH as of 4am EST and
   will develop into far southern Maine by 5am.

   DISCUSSION...Radar mosaic as of 430am EST shows an impressive
   frontogenetic snow band extending from near Binghamton, NY northeast
   through Albany, NY and developing across southern VT/NH.  Recent
   measured reports from Binghamton have reached 5 inches per hour for
   two hours earlier this morning and this band has yielded 2+ inches
   per hour at observation sites farther east-northeast during the past
   hour (3 inches at Albany, NY).  The strong 700-650 mb frontogenesis
   will continue to support the maintenance of an intense snow band in
   central NY through 7am and into southern VT/NH.  Co-located with the
   frontogenetic snow band, model guidance has indicated the heaviest
   rates (i.e., 4-5 inches per hour) have probably passed.  However,
   the strong lift favorably juxtaposed with the dendritic growth zone
   will likely result in snowfall rates 2-4 inches per hour through 7am
   from parts of central NY east into southern VT/NH, and persisting
   across VT/NH and into southern Maine during the 7am-10am period with
   rates in the 2-3 inches per hour range.

   ..Smith.. 12/17/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...GYX...BOX...BTV...ALY...BGM...

   LAT...LON   42327556 43417318 43857033 43876923 43377025 42827098
               42787178 42537330 41977515 42327556